By ARNO PEDRAM, Associated Press PARIS (AP) — The city of Paris is unveiling a monumental artwork built around an actual monument: the Arc de Triomphe completely wrapped in silver and blue fabric. The installation by late artist couple Christo and Jeanne-Claude, who conceived the project in 1961, will open on Saturday. Visits will take place for almost three weeks. At weekends, the Arc de Triomphe's